A project at Purley to replace a major rail junction will sever the main line to London over the festive period.
There will be major changes on services between London and the South Coast, and between London and Gatwick, from 11PM on 24 December 2015 until 4AM on Monday 4 January 2016.
During the period there will be no trains between South Croydon and Redhill, and the Gatwick Express service will be suspended.
Southern have set out details, along with alternative arrangements, on a page on their website.
Locally, a replacement bus service will operate for stations between Redhill and East Croydon, where trains to London can be boarded. In addition, Southern’s website gives details of other routes, such as travel to London via Dorking (with a “seven minute” walk between Dorking Deepdene and Dorking (main)), or via Tonbridge. These and other routes depend on day of travel.
Travellers are being advised to check train times at the National Rail journey planner.
Southern’s Christmas 2015 announcement (lists alternative travel routes, as well as information on New Year’s Eve travel)